Driving device



s. ZONIS 2,412,114v DRIVING DEVICE Dec. 3', 1946.

Filed Sept. 17, 1943 Patented Dec. 3, 1946 I DRIVING DEVICE Sydney Zonis, Bridgeport, Conn, assignor to The Singer Manufacturing Company, N. J a corporation of New Jersey Elizabeth,

Application September 17, 1943, Serial No. 502,742

8 Claims. CL 74-243) This invention relates to driving devices of the pulley and belt type, and more particularly to the type including belts provided with a series of cleats, clips or the like spaced uniformly from each other lengthwise of the belt. A cleat-belt of this type is disclosed, for example, in the United States patent of A. Steward, No. 667,830, Feb. 12, 1901.

Cleat-belts have been used extensively in connection with sewing machines; the employment of belts having spaced individual cleats or cleat-' clusters being dependent upon the driving load imposed upon the belts. For example, in the United States patent of F. Parry, No. 2,314,513, Mar. 23, 1943, pulleys carried by the bracket-arm and bed shafts of a sewing machine are illustrated as connected by a belt having spaced triple-cleat clusters, while the pulley of a rotary take-up shaft of the machine is shown as connected to another pulley of the arm-shaft by a belt having spaced individual cleats. In prior constructions of this character, it has been necessary to employ at least four pulleys subject to rapid acceleration and deceleration in starting and stopping operation of the machine.

The present invention has for an object to reduce the inertia of the operating mechanism of a machine, thereby to facilitate acceleration and deceleration of the operating mechanism.

Another object of the invention is to provide a combination pulley which is compact, of relatively low cost of manufacture and which lends itself readily to the application of cleat-belts thereto.

Other and more specific objects of the invention will be apparent from the following description and claims.

The invention consists in the structural features of the combination pulley and associated cleat-belts hereinafter described in connection with the accompanying drawing, which illustrates a preferred embodiment of the invention and in which:

Fig. 1 represents a vertical section of the bracket arm standard of a sewing machine containing the improved pulley and the belt connections therewith. Fig. 2 represents an enlarged vertical. section of the arm and bed shaft pulleys, with the connecting cluster-cleat belt partly broken away. Fig. 3 shows, the arm-shaft pulley and a portion of the individual-cleat belt in side elevation, as viewed. from the side opposite that shown in Fig. 1. Fig. 4 represents a perspective view of the improved combination pulley.

Referring to the drawing, the sewing machine 2 shown has a frame including a bed-plate I from which rises the hollow standard 2 of a bracketarm 3. Extending rearwardly from the upper portion of standard 2 is a recessed cover-plate 4.

Suitably journaled in the bracket-arm 3 is a rotary driving or arm-shaft 5, and rotatably journaled at the under side of the bed-plate l is a driven or bed-shaft 6 disposed substantially parallel to the arm or driving shaft 5. A third shaft 1 is rotatably disposed within the coverplate 4, substantially at the level of and parallel to the arm-shaft 5. It will be obvious that either the arm-shaft 5 or the bed-shaft 6 may be employed as the driving shaft.

Secured by a screw 8 upon the arm-shaft 5 is a hub 9 of a belt-pulley It]; said hub 9 having a shaft-opening H. One end of the pulley-hub 9 has a radial flange [2 integral with or carrying a cylindrical rim 55 of the pulley. The hubflange l2 preferably merges into or is connected to the pulley-rim i3 substantially medianly of the width of the pulley-rim, whereby a portion of the pul1ey-rim extends from one side of the flange [2 to overhang the hub 9 and another portion of the rim l3 extends from the opposite side of the flange I2 to overhang the arm-shaft 5 adjacent the hub 9.

The outer face of the pulley-rim I3 is provided with a plurality of narrow grooves M which alternate circumferentially of the rim l3 with a plurality of relatively wide grooves 15 also provided in said face; said grooves I4 and 15 extending widthwise of the pulley-rim l3 and being open at the opposite side edges of said pulleyrim. The outer face of the pulley-rim i3 is additionally provided substantially medianly of the width of said rim with a circumferential groove l6. Seated in the circumferential groove [6 is a belt separating member in the form of a Wire-ring ll intersecting the grooves hi and I5.

The bed-shaft ii carries a belt-pulley [8 of substantially the same size as the pulley l0 and having an external hub 19 secured by screws 20 upon the shaft 6. The belt-pulley l8 additionally has an internal hub 2| embracing the shaft 6. Between the hub-portions I9 and 2| is a radial hubfla-nge 22 carrying and preferably integral with one end of a pulley-rim 23 which overhangs the internal hub 2!.

The outer face of the pulley-rim 23 is provided with a series of belt-cleat receiving grooves 24 of substantially the same width as the wide grooves. l5 of the belt-pulley NJ. The grooves 24 preferably extend throughout the width of the pulley-rim 23 and are spaced from each other,

circumferentially of the rim 23, to correspond to the circumferential spacing of the wide grooves iii of the belt-pulley Hi. The outer face of the pulley-rim 23 is also provided adjacent one edge of the rim with a circumferential groove 25 receiving a belt-guard wire-ring 28. The wire-ring I1 of the pulley l and the wire-ring 26 of the pulley I8 are preferably disposed in a common plane.

The third shaft 1 carries a belt-pulley 21 which, in the present instance, is one half the size of the pulleys l0 and iii. The belt-pulley 211s provided in its outer face with a plurality of beltcleat receiving grooves 28 which extend transversely of the face of the pulley 21 and correspond in width to that of the narrow grooves M of the belt-pulley I 0. The belt-pulley 2'l is alined with the portion of the pulley H] at the left hand side of the belt-separating ring l1, while the beltpulley I8 is alined with the portion of the pulley ll] at the right hand side 'of said ring [1.

Engaging the belt-pulleys l0 and 2! is a cordbelt2'9 provided with a series of individual cleats 30'wh'ich extend transversely and are evenly spaced from each other lengthwise .cf the belt. The belt-cleats 30 protrude from the pulley-engaging face of the belt 29 and enter the pulleygrooves 28 which are proportioned to insure against slippage of the belt'upon the pulley. As illustrated in Fig. 3 of the drawings, the cleats 30 of the belt 29 also enter both the narrow grooves l4 and the wide grooves W of the beltpulley ill at the left hand side of the beltseparating ring [1. The narrow grooves I' l of the pulley i0 are proportioned correspondingly to the grooves 28 of the pulley 21, thereby also to insure against slippage of the belt 29 upon the pulley H3. The wide grooves of the pulley I i! provide clearance for the belt-cleats 30 disposed'between the cleats which engage the narrow grooves I l.

Engaging the pulleys Ill and i8 is another cordbelt 3! provided with a series of triple-cleat clusters 32 which are evenly spaced from each other lengthwise of the belt 3| the cleat-clusters "32 protruding from the pulley-engaging face of the belt 3| and being more Widely spaced from each other than are the individual cleats 3i of the belt 29. The cleat-clusters 32 each preferably comprise three individual cleats in contact with each-other, but it will be obvious that a single, correspondingly wide cleat or a different number of cleats may be employed.

The cleat-clusters 32 of the belt 3| enter the successive wide grooves 15 of the pulley ill at the right hand side of the ring IT and, with suffi- 'cient 'snugness to prevent slippage of the belt 3! upon said pulley; the belt-portions between the cleat-clusters 32 extending across the narrow grooves M of the pulley Ill. The cleat-clusters 32 of "the belt 3| also enter the grooves 26 of the bed-shaft pulley is to insure against slippage of the belt 3| upon that pulley.

The cord-belts 29 and 3| each comprise adjacent coils of cords; the cords of the two belts beingof opposite twists selected so that said belts both tend to creep toward the belt-separating ring H ofthe pulley it. This arrangement eliminatesany necessity for employing additional beltguard rings which would add to thein'ertia of the driving mechanism. 7 Furthermore, this 'arrangementleaves the (grooves open at the opposite ends thereof, whereby the'tvvo belts 29 and El may be more conveniently applied to the pulley IQ. Similarly, only one guard ringg'need'be employed in connection with'the belt-pulley '18. The belt 4 29 in the present instance is so short that no guard-ring need be employed in connection therewith, the guard-ring ll of the pulley l0 being sufficient to hold the belt 29 upon the pulley 21.

By extending both the narrow grooves l4 and the wide grooves I 5 of the pulley [0 across the entire widthwise face of said pulley, the pulley may be more readily manufactured, thereby reducing the cost thereof. Furthermore, the pulley metal thus additionally removed substantially decreases the weight of the pulley. The described combination pulley therefore has the advantages of compactness, lightness in weight and low manufacturing cost.

Having thus set forth the nature of the invention, what I claim herein is:

l. A driving member comprising a cleat-belt pulley having a cylindrical rim provided in the outer face thereof with a plurality of relatively narrow and belt-cleat receiving grooves successively alternating circumferentially and each extending widthwise across the entire belt face of said rim, and a belt-separating member extending circumferentially and disposed medianly of said face of the rim.

2. A driving member comprising a cleat-belt pulley having a cylindrical rim provided in the outer face thereof with a plurality of relatively narrow and wide belt-cle'at receiving grooves successively alternating circumferentially and each extending widthwise across the entire belt face of said rim, said grooves being open at the opposite ends thereof, and belt-separating means 'disp'osedmedianly of said face of the rim.

3. A driving member comprising a cleat-belt pulley having a cylindrical rim provided in the outer face thereof with a plurality of relatively narrow and wide belt-cleat receiving grooves successively alternating circumferentially and'each extending widthwise across the entire belt face of said rim, said face being additionally provided substantially medianly of the width thereof with a circumferential groove, and a belt-separating ring seated in said groove. I

4. A driving member comprising a cleat-belt pulley having a hub provided with a shaft-opening and with a flange extending radially from one end of the hub, a cylindricalrim carried by and widthwise extending in opposite directions from said flange, said rim beingprovided in the outer face thereof with a plurality of relatively narrow and wide belt-cleat receiving grooves successively alternating circumferentially and each extending widthwise across the entire belt face of said rim, and belt-separating means disposed upon the outer face of said rim.

5. A driving member comprising a cleat-belt pulley having a hub provided with a shaft-opening and with a flange extending radially from one end of the hub, a cylindrical rim'carried by said hub medianly of the width of said rim, said rim being provided in the outer face thereof with a plurality of relatively narrow and wide belt-cleat receiving grooves successively alternating circumferentially and each extending widthwise across the entire belt face of said rim, and'a beltseparatin'g member disposed medianly of said face of the rim.

'6. A driving device comprising a driving shaft,- agpair of driven shafts, a cleat-belt pulley mounted upon said driving shaft and having a cylindricalrim provided in the outer face'thereof with a plurality of relatively narrow'and :wide beltcleat receiving grooves alternating circumferen tially of said rim, a second cleat-belt pulley mounted upon one of said driven shafts and having a cylindrical rim provided with narrow cleatreceiving grooves corresponding in spacing and width to the narrow grooves of said first pulley, a cleat-belt connecting said two pulleys and having cleats spaced from each other lengthwise of the belt at a distance equal to the groove spacing of said second pulley, a third cleat-belt pulley mounted upon the other of said driven shafts and having a cylindrical rim provided with wide cleat-receiving grooves corresponding in spacing and width to the wide grooves of said first pulley, and a cleat-belt connecting said first and third pulleys and having cleats spaced from each other lengthwise of the belt at a distance equal to the groove spacing of said third pulley.

'7. In a driving device having a driving shaft, a pair of driven shafts, a cleat-belt pulley mounted upon one of said driven shafts and having a cylindrical rim provided in the outer face thereof with a plurality of relatively narrow cleat-receiving grooves, a cleat-belt operatively connecting said driving and the first mentioned driven shaft, said cleat-belt having cleats spaced from each other lengthwise of the belt at a distance equal to the groove spacing of said pulley, a second cleat-belt pulley mounted upon the other of said driven shafts and having a cylindrical rim provided with relatively wide cleat-receiving grooves each being circumferentially spaced from the other at a distance twice that distance between the grooves of the first mentioned pulley, and a second cleat-belt operatively connecting said driving and the second mentioned driven shaft, said second cleat-belt having cleats spaced from each other lengthwise of the beltat a distance equal to the groove spacing of said second pulley;

the improvement which comprises a third cleat-,

belt pulley mounted upon said driving shaft and having a hub provided with a shaft-opening and with a flange extending radially from the hub, a cylindrical rim carried by said flange and being provided in the outer face thereof with a plurality of relatively narrow and wide cleat-receiving grooves successively alternating circumferentially and extending widthwise across the entire belt face of said rim, said narrow and wide grooves corresponding in spacing and width with the respective grooves said belts embracing said third pulley in adjacent relation to each other, and a belt-separating member disposed between said belts and medianly of said face of the rim.

8. In a driving device having a driving shaft, a pair of driven shafts, a cleat-belt pulley mounted upon one of said driven shafts and having a cylindrical rim provided in the outer face thereof with a plurality of relatively narrow cleat-receiving grooves, a'cleat-belt operatively connecting said pulley with said driving shaft, said belt having cleats whose width lengthwise of the belt and whose spacing between cleats are equal substantially to the pulley groove width and the pulley groove spacing respectively, a second cleat-belt pulley mounted upon the other of said driven shafts and having a cylindrical rim provided with relatively wide cleat-receiving grooves each being circumferentially spaced from the other at a distance twice that of that distance between the grooves of the first mentioned pulley, and a second cleat-belt operatively connecting said second pulley with said driving shaft, said second belt having cleats whose width lengthwise of the belt and whose spacing between cleats are equal substantially to the groove width and groove spacing respectively of said second pulley; the improvement which comprises a third cleat-belt pulley mounted upon said driving shaft and having a hub provided with a shaft-opening and with a flange extending radially from the hub, a cylindrical rim carried by and widthwise extending in opposite directions from said flange, said rim being provided in the outer face thereof with a plurality of relatively narrow and wide belt-cleat receiving grooves successively alternating circumferentially and extending widthwise across the entire belt face of said rim, said narrow and wide grooves corresponding in spacing and width with the respective grooves of said first and second pulleys, said rim being additionally provided substantially medianly of the width thereof with a circumferential groove, and a belt-separating ring seated in said groove, said belts embracing said third pulley in adjacent relation to each other, with one belt disposed on either side of said ring.

SYDNEY ZONIS.

of said first and second pulleys, 

